MASTER Net MASTER Database: GRB250504.98 page

Please use the reference to MASTER DataBase as Lipunov et al., 2010, MASTER Robotic Net, Advances in Astronomy, vol. 2010, p.30L

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GRB coord: ErrorBox (deg): Sys Error (deg):
Sattel : Trigger: Notice:
GRB_Name: trignum: Nights after: FullSky


Name SWIFT GRB250504.98
Trignum 1310284
Trigger time 2025-05-04 23:25:57.47
Notice time 2025-05-04 23:26:46.929832
Coord, eb (17h 58m 26.88s , -40d 20m 56.4s) , 0.05
Max dist: 1 sigma 3 sigma
AGN candidates: Milliquas
r90wise
wiseXgaia
BL Lac candidates: 1 Sigma
3 Sigma

MASTER observatories and transients from them in error-field
Kislovodsk Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
Amur Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
Tunka Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
OAFA Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
IAC Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
SAAO Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
Tavrida Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
OAGH Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)

All alerts for this trigger
id noticetime coord2000 satel errorbox type trigger seq trig_type links
2860901 2025-05-04 23:45:04.481115 17h 58m 28.06s -40d 21m 59.1s ANTARES 0.000527778 1310284
2860871 2025-05-04 23:28:12.546339 17h 58m 30.77s -40d 20m 56.8s SWIFT 0 alert 1310284 1 68 alert
2860900 2025-05-04 23:37:01.735866 17h 58m 28.08s -40d 21m 57.6s SWIFT 0.0005 alert 1310284 2 67 alert
2860822 2025-05-04 23:26:46.929832 17h 58m 26.88s -40d 20m 56.4s SWIFT 0.05 alert 1310284 1 61 alert

DAYS:

MASTER optical transients in this field
Will be published in GCN, ATEL

Synchronous WFC images
Distance datetime coord2000 observatory camera links
90.3 2025-05-04 23:24:26.556 00h 00m 00.00s +00d 00m 00.0s OAFA 29008 Database OAFA
90.3 2025-05-04 23:22:58.555 00h 00m 00.00s +00d 00m 00.0s OAFA 111342 Database OAFA
Errorbox center visibility at MASTER facilities
trigger notice notice+1hr now

2025-05-04 23:25:57 (JD 2460800.476354)

Siderial time 16.813497 h

Ra 17:58:26.88 Dec -40:20:56.40
(269.612000d, -40.349000d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -20.58 Azimuth: 50.92

Sun: Altitude: 31.48 Azimuth: 283.11

Moon: Altitude: -19.49 Azimuth: 199.73

Tunka

Object: Altitude: -11.17 Azimuth: 35.29

Sun: Altitude: 16.14 Azimuth: 264.22

Moon: Altitude: -20.01 Azimuth: 175.08

Kislovodsk

Object: Altitude: 5.15 Azimuth: 350.46

Sun: Altitude: -22.00 Azimuth: 216.65

Moon: Altitude: -4.11 Azimuth: 119.92

Tavrida

Object: Altitude: 2.85 Azimuth: 344.12

Sun: Altitude: -24.45 Azimuth: 208.27

Moon: Altitude: 1.77 Azimuth: 113.94

SAAO

Object: Altitude: 61.52 Azimuth: 296.03

Sun: Altitude: -69.70 Azimuth: 319.84

Moon: Altitude: -11.91 Azimuth: 103.96

IAC

Object: Altitude: -5.42 Azimuth: 313.44

Sun: Altitude: -39.90 Azimuth: 149.58

Moon: Altitude: 38.34 Azimuth: 91.31

Argentina

Object: Altitude: -1.39 Azimuth: 321.00

Sun: Altitude: -19.57 Azimuth: 97.31

Moon: Altitude: 40.08 Azimuth: 176.59

Mexico

Object: Altitude: -74.98 Azimuth: 312.23

Sun: Altitude: 31.76 Azimuth: 90.54

Moon: Altitude: 53.03 Azimuth: 281.45

Ural

Object: Altitude: -7.46 Azimuth: 3.47

Sun: Altitude: -4.98 Azimuth: 229.62

Moon: Altitude: -4.80 Azimuth: 134.49

Vostryakovo

Object: Altitude: -6.85 Azimuth: 346.87

Sun: Altitude: -13.96 Azimuth: 210.12

Moon: Altitude: 4.09 Azimuth: 116.31

Gal. latitude: -8.622010 Gal. longitude: 351.777001

Dist. to Sun: 132.297401

Dist. to Moon: 129.620643

Moon coord.: (142.510143 d, 18.048229 d)

Sun coord.: (41.925350 d, 16.161154 d)

Lunar disk: 0.542028

Lunar phase: 85.178292

Lunar bright limb: 288.703886

No SN in this field

2025-05-04 23:26:46 (JD 2460800.476921)

Siderial time 16.827146 h

Ra 17:58:26.88 Dec -40:20:56.40
(269.612000d, -40.349000d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -20.69 Azimuth: 51.04

Sun: Altitude: 31.61 Azimuth: 283.29

Moon: Altitude: -19.45 Azimuth: 199.93

Tunka

Object: Altitude: -11.25 Azimuth: 35.43

Sun: Altitude: 16.27 Azimuth: 264.37

Moon: Altitude: -20.03 Azimuth: 175.28

Kislovodsk

Object: Altitude: 5.18 Azimuth: 350.62

Sun: Altitude: -21.91 Azimuth: 216.84

Moon: Altitude: -4.24 Azimuth: 120.06

Tavrida

Object: Altitude: 2.89 Azimuth: 344.27

Sun: Altitude: -24.38 Azimuth: 208.47

Moon: Altitude: 1.64 Azimuth: 114.07

SAAO

Object: Altitude: 61.67 Azimuth: 296.06

Sun: Altitude: -69.59 Azimuth: 319.38

Moon: Altitude: -12.07 Azimuth: 103.86

IAC

Object: Altitude: -5.29 Azimuth: 313.52

Sun: Altitude: -39.99 Azimuth: 149.81

Moon: Altitude: 38.16 Azimuth: 91.39

Argentina

Object: Altitude: -1.28 Azimuth: 320.89

Sun: Altitude: -19.74 Azimuth: 97.21

Moon: Altitude: 40.07 Azimuth: 176.34

Mexico

Object: Altitude: -74.85 Azimuth: 311.90

Sun: Altitude: 31.59 Azimuth: 90.64

Moon: Altitude: 53.19 Azimuth: 281.60

Ural

Object: Altitude: -7.47 Azimuth: 3.63

Sun: Altitude: -4.89 Azimuth: 229.80

Moon: Altitude: -4.88 Azimuth: 134.66

Vostryakovo

Object: Altitude: -6.82 Azimuth: 347.02

Sun: Altitude: -13.90 Azimuth: 210.32

Moon: Altitude: 3.98 Azimuth: 116.47

Gal. latitude: -8.622010 Gal. longitude: 351.777001

Dist. to Sun: 132.297906

Dist. to Moon: 129.613702

Moon coord.: (142.517135 d, 18.045468 d)

Sun coord.: (41.925897 d, 16.161316 d)

Lunar disk: 0.542085

Lunar phase: 85.171660

Lunar bright limb: 288.705978

No SN in this field

2025-05-05 00:26:46 (JD 2460800.518588)

Siderial time 17.829884 h

Ra 17:58:26.88 Dec -40:20:56.40
(269.612000d, -40.349000d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -28.60 Azimuth: 60.15

Sun: Altitude: 40.59 Azimuth: 297.27

Moon: Altitude: -15.45 Azimuth: 213.80

Tunka

Object: Altitude: -17.28 Azimuth: 45.47

Sun: Altitude: 25.53 Azimuth: 276.20

Moon: Altitude: -19.82 Azimuth: 189.98

Kislovodsk

Object: Altitude: 5.87 Azimuth: 2.10

Sun: Altitude: -14.46 Azimuth: 229.83

Moon: Altitude: -12.94 Azimuth: 130.93

Tavrida

Object: Altitude: 4.76 Azimuth: 355.59

Sun: Altitude: -18.18 Azimuth: 222.44

Moon: Altitude: -7.52 Azimuth: 124.45

SAAO

Object: Altitude: 72.82 Azimuth: 302.98

Sun: Altitude: -59.40 Azimuth: 295.12

Moon: Altitude: -24.04 Azimuth: 96.57

IAC

Object: Altitude: 3.75 Azimuth: 320.55

Sun: Altitude: -44.75 Azimuth: 168.27

Moon: Altitude: 25.34 Azimuth: 97.47

Argentina

Object: Altitude: 7.42 Azimuth: 313.43

Sun: Altitude: -32.46 Azimuth: 89.66

Moon: Altitude: 37.60 Azimuth: 158.85

Mexico

Object: Altitude: -64.20 Azimuth: 299.40

Sun: Altitude: 18.79 Azimuth: 97.97

Moon: Altitude: 64.88 Azimuth: 296.21

Ural

Object: Altitude: -8.80 Azimuth: 15.11

Sun: Altitude: 1.89 Azimuth: 242.52

Moon: Altitude: -10.02 Azimuth: 147.60

Vostryakovo

Object: Altitude: -5.75 Azimuth: 358.49

Sun: Altitude: -8.74 Azimuth: 224.04

Moon: Altitude: -3.15 Azimuth: 128.31

Gal. latitude: -8.622010 Gal. longitude: 351.777001

Dist. to Sun: 132.335022

Dist. to Moon: 129.103856

Moon coord.: (143.029943 d, 17.842095 d)

Sun coord.: (41.966041 d, 16.173266 d)

Lunar disk: 0.546318

Lunar phase: 84.684747

Lunar bright limb: 288.858376

No SN in this field

2025-05-05 17:28:20 (JD 2460801.228009)

Siderial time 10.902611 h

Ra 17:58:26.88 Dec -40:20:56.40
(269.612000d, -40.349000d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -1.78 Azimuth: 347.71

Sun: Altitude: -18.03 Azimuth: 211.06

Moon: Altitude: 3.53 Azimuth: 108.14

Tunka

Object: Altitude: -8.70 Azimuth: 329.87

Sun: Altitude: -21.59 Azimuth: 186.54

Moon: Altitude: 18.85 Azimuth: 89.20

Kislovodsk

Object: Altitude: -33.66 Azimuth: 296.06

Sun: Altitude: -12.15 Azimuth: 127.25

Moon: Altitude: 57.12 Azimuth: 31.34

Tavrida

Object: Altitude: -39.64 Azimuth: 291.27

Sun: Altitude: -6.55 Azimuth: 120.88

Moon: Altitude: 58.67 Azimuth: 15.86

SAAO

Object: Altitude: -0.15 Azimuth: 320.21

Sun: Altitude: -20.37 Azimuth: 96.93

Moon: Altitude: 43.17 Azimuth: 186.36

IAC

Object: Altitude: -69.77 Azimuth: 311.71

Sun: Altitude: 27.84 Azimuth: 94.46

Moon: Altitude: 48.57 Azimuth: 280.85

Argentina

Object: Altitude: -11.65 Azimuth: 25.09

Sun: Altitude: 40.00 Azimuth: 162.43

Moon: Altitude: -11.54 Azimuth: 260.30

Mexico

Object: Altitude: -30.87 Azimuth: 58.63

Sun: Altitude: 61.29 Azimuth: 294.47

Moon: Altitude: -28.05 Azimuth: 229.76

Ural

Object: Altitude: -30.06 Azimuth: 298.84

Sun: Altitude: -10.33 Azimuth: 143.88

Moon: Altitude: 40.07 Azimuth: 45.03

Vostryakovo

Object: Altitude: -40.64 Azimuth: 284.98

Sun: Altitude: -2.83 Azimuth: 124.64

Moon: Altitude: 47.77 Azimuth: 17.78

Gal. latitude: -8.622010 Gal. longitude: 351.777001

Dist. to Sun: 132.966193

Dist. to Moon: 120.471090

Moon coord.: (151.509194 d, 14.226790 d)

Sun coord.: (42.650122 d, 16.375518 d)

Lunar disk: 0.616872

Lunar phase: 76.482391

Lunar bright limb: 291.066367

No SN in this field
Recent coverage and limits telegrams

 #######################################################################################
#######################################################################################

  ID = 12501
TYPE = 35
DAYS = 0.5


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB 250504A ( M. J. Moss et al., GCN 40343) errorbox  14 sec after notice time and 40 sec after trigger time at 2025-05-04 23:26:38 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 29 deg. The sun  altitude  is -70.3 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB 250504A errorbox  3376 sec after notice time and 3402 sec after trigger time at 2025-05-05 00:22:40 UT, with upper limit up to  16.9 mag. The observations began at zenith distance = 83 deg. The sun  altitude  is -31.9 deg. 

The galactic latitude b = -9 deg., longitude l = 352 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2860807

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      46 |         MASTER-SAAO |   C |    10 | 16.7 |        
      61 |         MASTER-SAAO |   C |    40 | 17.2 |  Coadd 
      71 |         MASTER-SAAO |   C |    60 | 17.2 |  Coadd 
      75 |         MASTER-SAAO |   C |    10 | 16.7 |        
     109 |         MASTER-SAAO |   C |    20 | 17.0 |        
     148 |         MASTER-SAAO |   C |    20 | 17.0 |        
     193 |         MASTER-SAAO |   C |   110 | 17.3 |  Coadd 
     246 |         MASTER-SAAO |   C |    40 | 17.2 |        
     421 |         MASTER-SAAO |   C |   390 | 17.5 |  Coadd 
     310 |         MASTER-SAAO |   C |    50 | 17.2 |        
     400 |         MASTER-SAAO |   C |   230 | 17.5 |  Coadd 
     384 |         MASTER-SAAO |   C |    60 | 17.3 |        
     444 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
     463 |         MASTER-SAAO |   C |    60 | 17.3 |        
     542 |         MASTER-SAAO |   C |    60 | 17.3 |        
     621 |         MASTER-SAAO |   C |    60 | 17.3 |        
     681 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
     701 |         MASTER-SAAO |   C |    60 | 17.3 |        
     780 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1350 |         MASTER-SAAO |   C |  1200 | 17.5 |  Coadd 
     858 |         MASTER-SAAO |   C |    60 | 17.3 |        
     918 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
     937 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1016 |         MASTER-SAAO |   C |    60 | 17.2 |        
    1095 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1155 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
    1175 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1254 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1333 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1393 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
    1413 |         MASTER-SAAO |   C |    60 | 17.2 |        
    1492 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1571 |         MASTER-SAAO |   C |    60 | 17.2 |        
    1631 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
    1650 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1729 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1808 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1868 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
    1887 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1966 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2045 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2105 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
    2125 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2204 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2283 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2343 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
    2362 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2441 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2520 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2580 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
    2599 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2678 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2757 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2817 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
    2836 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2916 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2995 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3055 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
    3074 |         MASTER-SAAO |   C |    60 | 17.2 |        
    3153 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3232 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3292 |         MASTER-SAAO |   C |   180 | 17.4 |  Coadd 
    3311 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3391 |         MASTER-SAAO |   C |    60 | 17.2 |        
    3433 |         MASTER-OAFA |   C |    60 | 12.4 |        
    3470 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3530 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
    3509 |         MASTER-OAFA |   C |    60 | 12.8 |        
    3549 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3584 |         MASTER-OAFA |   C |    60 | 13.4 |        
    3628 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3660 |         MASTER-OAFA |   C |    60 | 13.3 |        
    3707 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3767 |         MASTER-SAAO |   C |   180 | 17.5 |  Coadd 
    3735 |         MASTER-OAFA |   C |    60 | 13.5 |        
    3786 |         MASTER-SAAO |   C |    60 | 17.2 |        
    3812 |         MASTER-OAFA |   C |    60 | 13.1 |        
    3866 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3888 |         MASTER-OAFA |   C |    60 | 13.3 |        
    3945 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4005 |         MASTER-SAAO |   C |   180 | 17.4 |  Coadd 
    3964 |         MASTER-OAFA |   C |    60 | 14.0 |        
    4024 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4042 |         MASTER-OAFA |   C |    60 | 14.1 |        
    4103 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4118 |         MASTER-OAFA |   C |    60 | 13.7 |        
    4182 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4242 |         MASTER-SAAO |   C |   180 | 17.3 |  Coadd 
    4298 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4377 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4423 |         MASTER-OAFA |   C |    60 | 13.2 |        
    4470 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4530 |         MASTER-SAAO |   C |   180 | 17.3 |  Coadd 
    4499 |         MASTER-OAFA |   C |    60 | 12.7 |        
    4549 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4578 |         MASTER-OAFA |   C |    60 | 12.5 |        
    4652 |         MASTER-OAFA |   C |    60 | 12.3 |        
    4728 |         MASTER-OAFA |   C |    60 | 12.1 |        
    4759 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4806 |         MASTER-OAFA |   C |    60 | 13.6 |        
    4881 |         MASTER-OAFA |   C |    60 | 13.7 |        
    4956 |         MASTER-OAFA |   C |    60 | 13.8 |        
    5032 |         MASTER-OAFA |   C |    60 | 13.3 |        
    5109 |         MASTER-OAFA |   C |    60 | 12.7 |        
    5641 |         MASTER-OAFA |   C |    60 | 12.1 |        
    5717 |         MASTER-OAFA |   C |    60 | 12.6 |        
    5797 |         MASTER-OAFA |   C |    60 | 12.8 |        
    6739 |         MASTER-SAAO |   C |   180 | 17.2 |        
    8637 |         MASTER-OAFA |   C |    60 | 16.0 |        
    8716 |         MASTER-OAFA |   C |    60 | 15.7 |        
    8794 |         MASTER-OAFA |   C |    60 | 14.8 |        
    8869 |         MASTER-OAFA |   C |    60 | 14.5 |        
    8948 |         MASTER-OAFA |   C |    60 | 14.4 |        
    9026 |         MASTER-OAFA |   C |    60 | 14.9 |        
    9104 |         MASTER-OAFA |   C |    60 | 15.4 |        
    9181 |         MASTER-OAFA |   C |    60 | 15.6 |        
    9257 |         MASTER-OAFA |   C |    60 | 15.6 |        
    9861 |         MASTER-OAFA |   C |    60 | 16.0 |        
    9936 |         MASTER-OAFA |   C |    60 | 15.9 |        
   10013 |         MASTER-OAFA |   C |    60 | 16.1 |        
   10086 |         MASTER-OAFA |   C |    60 | 15.9 |        
   10165 |         MASTER-OAFA |   C |    60 | 15.8 |        
   10242 |         MASTER-OAFA |   C |    60 | 15.6 |        
   11745 |         MASTER-OAFA |   C |    60 | 16.6 |        
   11822 |         MASTER-OAFA |   C |    60 | 16.7 |        
   11898 |         MASTER-OAFA |   C |    60 | 16.9 |        
   12424 |         MASTER-SAAO |   C |   180 | 16.7 |        
   12624 |         MASTER-SAAO |   C |   180 | 16.7 |        
   12823 |         MASTER-SAAO |   C |   180 | 16.7 |        
   13023 |         MASTER-SAAO |   C |   180 | 16.7 |        
   13222 |         MASTER-SAAO |   C |   180 | 16.7 |        
   13422 |         MASTER-SAAO |   C |   180 | 16.8 |        
   13621 |         MASTER-SAAO |   C |   180 | 16.9 |        
   14936 |         MASTER-SAAO |   C |   180 | 17.0 |        
   15056 |         MASTER-SAAO |   C |   420 | 17.1 |  Coadd 
   15106 |         MASTER-SAAO |   C |   120 | 17.1 |        
   15346 |         MASTER-SAAO |   C |   600 | 17.2 |  Coadd 
   15343 |         MASTER-SAAO |   C |   120 | 17.2 |        
   15802 |         MASTER-SAAO |   C |   120 | 17.1 |        
   15922 |         MASTER-SAAO |   C |   360 | 17.1 |  Coadd 
   15941 |         MASTER-SAAO |   C |   120 | 17.1 |        
   16081 |         MASTER-SAAO |   C |   120 | 17.1 |        
   16250 |         MASTER-SAAO |   C |   180 | 17.0 |        
   16370 |         MASTER-SAAO |   C |   420 | 17.1 |  Coadd 
   16420 |         MASTER-SAAO |   C |   120 | 17.2 |        
   16559 |         MASTER-SAAO |   C |   120 | 17.2 |        
   16699 |         MASTER-SAAO |   C |   120 | 17.1 |        
   16849 |         MASTER-SAAO |   C |   420 | 17.1 |  Coadd 
   16838 |         MASTER-SAAO |   C |   120 | 17.1 |        
   17502 |         MASTER-SAAO |   C |   180 | 17.0 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 12500
TYPE = 35
DAYS = 0.1


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB 250504A ( M. J. Moss et al., GCN 40343) errorbox  14 sec after notice time and 40 sec after trigger time at 2025-05-04 23:26:38 UT, with upper limit up to  17.3 mag. The observations began at zenith distance = 29 deg. The sun  altitude  is -70.3 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB 250504A errorbox  3376 sec after notice time and 3402 sec after trigger time at 2025-05-05 00:22:40 UT, with upper limit up to  14.1 mag. The observations began at zenith distance = 83 deg. The sun  altitude  is -31.9 deg. 

The galactic latitude b = -9 deg., longitude l = 352 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2860807

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      46 |         MASTER-SAAO |   C |    10 | 16.7 |        
      75 |         MASTER-SAAO |   C |    10 | 16.7 |        
     109 |         MASTER-SAAO |   C |    20 | 17.0 |        
     148 |         MASTER-SAAO |   C |    20 | 17.0 |        
     246 |         MASTER-SAAO |   C |    40 | 17.2 |        
     310 |         MASTER-SAAO |   C |    50 | 17.2 |        
     384 |         MASTER-SAAO |   C |    60 | 17.3 |        
     463 |         MASTER-SAAO |   C |    60 | 17.3 |        
     542 |         MASTER-SAAO |   C |    60 | 17.3 |        
     621 |         MASTER-SAAO |   C |    60 | 17.3 |        
     701 |         MASTER-SAAO |   C |    60 | 17.3 |        
     780 |         MASTER-SAAO |   C |    60 | 17.3 |        
     858 |         MASTER-SAAO |   C |    60 | 17.3 |        
     937 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1016 |         MASTER-SAAO |   C |    60 | 17.2 |        
    1095 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1175 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1254 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1333 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1413 |         MASTER-SAAO |   C |    60 | 17.2 |        
    1492 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1571 |         MASTER-SAAO |   C |    60 | 17.2 |        
    1650 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1729 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1808 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1887 |         MASTER-SAAO |   C |    60 | 17.3 |        
    1966 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2045 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2125 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2204 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2283 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2362 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2441 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2520 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2599 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2678 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2757 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2836 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2916 |         MASTER-SAAO |   C |    60 | 17.3 |        
    2995 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3074 |         MASTER-SAAO |   C |    60 | 17.2 |        
    3153 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3232 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3311 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3391 |         MASTER-SAAO |   C |    60 | 17.2 |        
    3433 |         MASTER-OAFA |   C |    60 | 12.4 |        
    3470 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3509 |         MASTER-OAFA |   C |    60 | 12.8 |        
    3549 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3584 |         MASTER-OAFA |   C |    60 | 13.4 |        
    3628 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3660 |         MASTER-OAFA |   C |    60 | 13.3 |        
    3707 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3735 |         MASTER-OAFA |   C |    60 | 13.5 |        
    3786 |         MASTER-SAAO |   C |    60 | 17.2 |        
    3812 |         MASTER-OAFA |   C |    60 | 13.1 |        
    3866 |         MASTER-SAAO |   C |    60 | 17.3 |        
    3888 |         MASTER-OAFA |   C |    60 | 13.3 |        
    3945 |         MASTER-SAAO |   C |    60 | 17.2 |        
    3964 |         MASTER-OAFA |   C |    60 | 14.0 |        
    4024 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4042 |         MASTER-OAFA |   C |    60 | 14.1 |        
    4103 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4118 |         MASTER-OAFA |   C |    60 | 13.7 |        
    4182 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4298 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4377 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4423 |         MASTER-OAFA |   C |    60 | 13.2 |        
    4470 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4499 |         MASTER-OAFA |   C |    60 | 12.7 |        
    4549 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4578 |         MASTER-OAFA |   C |    60 | 12.5 |        
    4652 |         MASTER-OAFA |   C |    60 | 12.3 |        
    4728 |         MASTER-OAFA |   C |    60 | 12.1 |        
    4759 |         MASTER-SAAO |   C |    60 | 17.2 |        
    4806 |         MASTER-OAFA |   C |    60 | 13.6 |        
    4881 |         MASTER-OAFA |   C |    60 | 13.7 |        
    4956 |         MASTER-OAFA |   C |    60 | 13.8 |        
    5032 |         MASTER-OAFA |   C |    60 | 13.3 |        
    5109 |         MASTER-OAFA |   C |    60 | 12.7 |        
    5641 |         MASTER-OAFA |   C |    60 | 12.1 |        
    5717 |         MASTER-OAFA |   C |    60 | 12.6 |        
    5797 |         MASTER-OAFA |   C |    60 | 12.8 |        
    6739 |         MASTER-SAAO |   C |   180 | 17.2 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 12496
TYPE = 35
DAYS = 0


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB250504.98 (trigger No 1310284,17h 58m 26.88s , -40d 20m 56.4s, R=0.05) errorbox  14 sec after notice time and 40 sec after trigger time at 2025-05-04 23:26:38 UT, with upper limit up to  16.7 mag. The observations began at zenith distance = 29 deg. The sun  altitude  is -70.3 deg. 

The galactic latitude b = -9 deg., longitude l = 352 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2860822

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      46 |         MASTER-SAAO |   C |    10 | 16.7 |        
      75 |         MASTER-SAAO |   C |    10 | 16.7 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 12495
TYPE = 35
DAYS = 0


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB250504.98 (trigger No 1310284,17h 58m 26.88s , -40d 20m 56.4s, R=0.05) errorbox  14 sec after notice time and 40 sec after trigger time at 2025-05-04 23:26:38 UT, with upper limit up to  16.7 mag. The observations began at zenith distance = 29 deg. The sun  altitude  is -70.3 deg. 

The galactic latitude b = -9 deg., longitude l = 352 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2860822

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      46 |         MASTER-SAAO |   C |    10 | 16.7 |        
      75 |         MASTER-SAAO |   C |    10 | 16.7 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 12494
TYPE = 34
DAYS = 0


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB250504.98 (trigger No 1310284,17h 58m 26.88s , -40d 20m 56.4s, R=0.05) errorbox  14 sec after notice time and 40 sec after trigger time at 2025-05-04 23:26:38 UT, with upper limit up to  16.7 mag. The observations began at zenith distance = 29 deg. The sun  altitude  is -70.3 deg. 

The galactic latitude b = -9 deg., longitude l = 352 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2860822

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      46 |         MASTER-SAAO |   C |    10 | 16.7 |        
      75 |         MASTER-SAAO |   C |    10 | 16.7 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.

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